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Red Hat: CVE-2020-26961: CVE-2020-26961 Mozilla: DoH did not filter IPv4 mapped IP Addresses (Multiple Advisories)

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Red Hat: CVE-2020-26961: CVE-2020-26961 Mozilla: DoH did not filter IPv4 mapped IP Addresses (Multiple Advisories)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
11/30/2020
Created
12/02/2020
Added
12/01/2020
Modified
12/15/2023

Description

When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Solution(s)

  • redhat-upgrade-firefox
  • redhat-upgrade-firefox-debuginfo
  • redhat-upgrade-firefox-debugsource
  • redhat-upgrade-thunderbird
  • redhat-upgrade-thunderbird-debuginfo
  • redhat-upgrade-thunderbird-debugsource

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